Working and College in South Korea

Hi all! I was wondering if it was possible to work in South Korea while on a student visa. I am thinking of transferring to a Starbucks in Korea and will it mess up something with my visa if I already have a job before I enroll in school? I heard that you cannot work for 6 months with a D2 (i think) visa, so does it still apply if you already have a job in Korea?

Many thanks, any help would be well appreciated.

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